Voters across Union County will go to the polls Tuesday to choose candidates in primary elections for municipal and county offices.The Star-Ledger

UNION COUNTY — A former Hillside councilman and two running mates are challenging incumbent freeholders for the Democratic nomination in one of many primary battles across the county.

In addition to the county-level race Tuesday, mayoral contests are on the ballots in Berkeley Heights, Linden and Rahway.

Union County Freeholder candidates include former Hillside councilman Jorge Batista, Marvelis Perreira of Elizabeth, who previously made an unsuccessful bid for that city's council, and Tamara Twitty, also of Elizabeth. The trio is running under the banner True Democrats for Change.

In Kenilworth, Dominick Costa is challenging Councilman Kevin Leary and newcomer Miguel Carvalho for the Republican nomination to seek a council seat. Leary and Carvalho are endorsed by the GOP committee.

Linden Democrats have the largest candidates slate. Three people are vying for the nomination to run for mayor, including Councilwoman Rhashonna Cosby-Hurling, who has the party's support; Council Derek Armstead, who is making his second bid for mayor; and newcomer Michael Puzio.